Glacier National Park, Montana, Grinnell Glacier, southern portion of separating wall. Description with photo reads: "Not many years ago the upper and lower portions of Grinnell Glacier were one solid mass of ice. There is now a vertical wall of...

The author categorizes forest vegetation across Montana into eight geographic subdivisions called ""forest regions. M The regions correlate the influence of climate and general topography to forest vegetation—including the distributions of tree...